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Components of Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:          
Federal     $ 6.6 $ 3.0 $ 0.0
Foreign     0.0 0.3 0.4
State and local     1.8 1.3 0.9
Current, Total     8.4 4.6 1.3
Deferred:          
Federal     25.4 17.8 (112.1)
Foreign     (2.0) (3.0) 0.9
State and local     2.3 4.3 1.3
Deferred, Total     25.7 19.1 (109.9)
Total income tax provision $ (1.4) $ (3.5) $ 34.1 $ 23.7 $ (108.6)